diff --git a/Changes b/Changes
index 9e46970756..5184a72573 100644
--- a/Changes
+++ b/Changes
@@ -12,6 +12,8 @@ inventory:
 * Fix #442: kaspersky not fully recognized in russia
 * Fix #501: wrong status was reported when windows defender was disabled
 * Enhanced software inventory under Arch Linux
+* Fix #453: under MacOS, skip XML DTD validation for software inventory as
+  parsing may fail if a proxy is enabled
 
 deploy:
 * Bump Deploy task version to 2.7
diff --git a/lib/FusionInventory/Agent/Tools/MacOS.pm b/lib/FusionInventory/Agent/Tools/MacOS.pm
index 72c99fd603..b11a9d83f1 100644
--- a/lib/FusionInventory/Agent/Tools/MacOS.pm
+++ b/lib/FusionInventory/Agent/Tools/MacOS.pm
@@ -46,6 +46,10 @@ sub _initXmlParser {
     } elsif ($params{file}) {
         $xmlParser = XML::XPath->new(filename => $params{file});
     }
+
+    # Don't validate XML against DTD, parsing may fail if a proxy is active
+    $XML::XPath::ParseParamEnt = 0;
+
     return $xmlParser;
 }